<template>
    <div class="article-container">
        <!-- 导航栏 -->
        <van-nav-bar class="page-nav-bar" left-arrow @click-left="back()" title="黑马头条"></van-nav-bar>
        <!-- /导航栏 -->

        <div class="main-wrap">
            <!-- 加载中 -->
            <div class="loading-wrap" v-if="loading">
                <van-loading color="#3296fa" vertical>加载中</van-loading>
            </div>
            <!-- /加载中 -->

            <!-- 加载完成-文章详情 -->
            <div class="article-detail" v-else-if="article.title">
                <!-- 文章标题 -->
                <h1 class="article-title">{{article.title}}</h1>
                <!-- /文章标题 -->

                <!-- 用户信息 -->
                <van-cell class="user-info" center :border="false">
                    <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
                    <div slot="title" class="user-name">{{article.aut_name}}</div>
                    <div slot="label" class="publish-date">{{article.pubdate|setTime}}</div>
                    <follow-user class="follow-btn" :user-id="article.aut_id" v-model="article.is_followed" @update-is_followed="article.is_followed=$event"></follow-user>
                    <!-- <van-button v-if="article.is_followed" :loading="followLoading" class="follow-btn" round size="small" @click="onFollow">已关注</van-button>
                    <van-button v-else class="follow-btn" :loading="followLoading" type="info" color="#3296fa" round size="small" @click="onFollow" icon="plus">关注</van-button> -->

                </van-cell>
                <!-- /用户信息 -->

                <!-- 文章内容 -->
                <div class="article-content markdown-body" ref="article-content" v-html="article.content"></div>
                <van-divider>正文结束</van-divider>
                <!-- 文章评论列表 -->
                <comment-list :source="article.art_id"></comment-list>

                <!-- 底部区域 -->
                <div class="article-bottom">
                    <van-button class="comment-btn" type="default" round size="small">写评论</van-button>
                    <van-icon name="comment-o" info="123" color="#777" />
                    <collect-article :article-id="article.art_id" v-model="article.is_collected"></collect-article>
                    <!-- <van-icon color="#777" name="good-job-o" /> -->
                    <like-article v-model="article.attitude" :article-id="article.art_id"></like-article>
                    <van-icon name="share" color="#777777"></van-icon>
                </div>
                <!-- /底部区域 -->
            </div>
            <!-- /加载完成-文章详情 -->

            <!-- 加载失败：404 -->
            <div class="error-wrap" v-else-if="errState===404">
                <van-icon name="failure" />
                <p class="text">该资源不存在或已删除！</p>
            </div>
            <!-- /加载失败：404 -->

            <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
            <div class="error-wrap" v-else>
                <van-icon name="failure" />
                <p class="text">内容加载失败！</p>
                <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
            </div>
            <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
        </div>
    </div>
</template>

<script>
import { getArticleById } from "@/api/article";
import { ImagePreview } from "vant";
import FollowUser from "../../components/follow-user.vue";
import CollectArticle from "../../components/collect-article.vue";
import LikeArticle from '../../components/like-article.vue';
import CommentList from './components/comment-list.vue';
export default {
  name: "ArticleIndex",
  components: { FollowUser, CollectArticle, LikeArticle, CommentList },
  props: {
    articleId: {
      type: [Number, String],
      required: true,
    },
  },
  data() {
    return {
      article: {}, //文章详情
      loading: true, //加载中
      errState: 0, //失败状态码
      followLoading: false,
    };
  },
  methods: {
    //加载文章详情
    async loadArticle() {
      this.loading = true;
      try {
        const { data } = await getArticleById(this.articleId);
        this.article = data.data;
        setTimeout(() => {
          this.previewImage();
        }, 0);
      } catch (err) {
        console.log(err);
        if (err.response && err.response.status === 404) {
          this.errState = 404;
        }
      }
      this.loading = false;
    },
    //预览图片
    previewImage() {
      const articleContent = this.$refs["article-content"];
      const imgs = articleContent.querySelectorAll("img");
      const images = [];
      imgs.forEach((img, index) => {
        images.push(img.src);
        img.onclick = () => {
          ImagePreview({
            images,
            startPosition: index,
          });
        };
      });
      console.log(imgs);
    },
    back() {
      this.$router.go(-1);
    },
  },
  mounted() {
    this.loadArticle();
  },
};
</script>

<style lang="scss" scoped>
@import "./github-markdown.css";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>